CHAPTER Surface Area - School District #35

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Name: _____________________________________________________ Date: ______________ Look at the rectangular prism-shaped building you sketched in the Math Link on page 244. How much material do you need to cover the outside walls and the roof a) Draw and label the shapes of the front and back walls. b) Area of front and back walls c) Draw and label the shapes of the side walls. d) Area of side walls e) Draw and label the shape of the roof. f) Area of roof g) What is the total area of the walls and roof of the building Sentence: ____________________________________________________________________ 254 MHR ● Chapter 5: Surface Area
Name: _____________________________________________________ Date: ______________ 5.4 Warm Up 1. Calculate the diameter or radius. a) b) 28 mm 2.6 mm d = 2 × r = 2 × = cm r = d ÷ 2 = ÷ 2 = 2. Estimate and calculate the circumference. Estimate: Calculate: 2.2 cm C = π × d ← Formula → C = π × d ≈ 3 × 2 ← Substitute → = 3.14 × 2.2 ≈ means approximate. ≈ cm ← Solve → = cm 3. Estimate and calculate the area. Round your answer to 1 decimal place. Estimate: r ≈ Calculate: r = 6.2 cm A = π × r 2 ≈ 3 × ← Formula → 2 ≈ 3 × × ← Solve → ≈ cm 2 ← Substitute → A = π × r 2 = 3.14 × = 3.14 × × = cm 2 2 4. Round each number. a) 3.165 (tenth) ≈ b) 273.185 (hundredth) ≈ 5.4 Warm Up ● MHR 255
Page 1 and 2: CHAPTER 5 Surface Area GET READY 22
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CHAPTER Surface Area - School District #35

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